Abstract
This paper aims to understand the flow structure around submerged dike in the main channel and flood plain of a compound cross section. The study undertaken to develop this understanding was carried out in a laboratory flume using a submerged vane installed at a 90 degree angle to the bank. In order to study the flow structures, the flow velocity was measured using a three-dimensional Acoustic Doppler Velocity meter (micro-ADV) with data collection rate of 50 Hz. These flow velocity measurements were taken at 500 points on a regular grid. As the tests were undertaken with turbulent flow, these conditions were subcritical. Furthermore, all the tests were undertaken using a fixed bed. The results obtained showed that the momentum transfer and the kinetic energy reduced in two directions. Also the energy and momentum coefficients decreased significantly with the installation of the submerged vane inside the main channel. Finally, streamlines were found to deviate from the side walls of channel into the main channel.
Highlights
Urban planning, industrial development and agricultural investment necessitates a better understanding flood plain management and flow hydraulics in channels with flood plains
This paper aims to understand the flow structure around submerged dike in the main channel and flood plain of a compound cross section
The results obtained showed that the momentum transfer and the kinetic energy reduced in two directions
Summary
Industrial development and agricultural investment necessitates a better understanding flood plain management and flow hydraulics in channels with flood plains. Discharge, shear stress and vortex are the causes of river bed erosion and river bank failure and the destruction of river walls (Figure 1) Protective structures such as dikes, spur dikes and submerged vanes can prevent the occurrence of river bed erosion and river bank failure in river. A submerged vane is a developed form of depth panels which were used by Odggard et al [1] to prevent the erosion of the outside bank of a river Since these submerged vanes have been used for a variety of purposes in different projects including the prevention of the accumulation of sediment in turn-out openings and near the pump stations. This kind of structure is suitable for modifying river paths with sandy beds, and it may be effective for rivers with gravel beds
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